For me, the biggest killer of the psu was the ignorance of the end user, caused by lack of info from the manufacturer. Even a single broken MLCC can result in issues, and they can crack due to any of the following:This may sound silly, but in some cases, mounting screws that are too long can actually cause shorts to the PCB.If the manufacturing line is set at higher than normal speeds, and the applied heat is high, there can be either fatal or minor damage to ICs and MOSFETS, both of which will in the long run (or under stressful conditions) eventually cause the PSU's failure.Besides high voltage spikes, which can be caused by weather conditions (i.e., lightning) or other problems in the mains grids, high currents can be sunk from the mains due to sudden (transient) energy demands caused by or during the system's startup. Brown outs aren't good for a psu. 4. This in itself can be a cause of inverter failure. While they are very rare, they have a much bigger impact.The electricity outage on 9 August was caused by two power stations tripping within two minutes of each other.A 666MW gas-fired plant in Little Barford, Bedfordshire, and an 800MW offshore wind farm in Hornsea, Yorkshire, had unplanned shutdowns shortly before 5pm BST.Phil Hewitt, director at energy data and insights provider EnAppSys, says But the loss of generation on this occasion was much bigger than the energy operator could cope with using the standard tools at its disposal.This meant it had to disconnect some recipients to meet the demand with the available capacity.“It is not clear if the shutdowns were coincidental or whether one was as a consequence of the other event,” he says.The grid frequency in the UK is 50 hertz (Hz) – which measures the rate of electrical current cycles per second – and is stabilised by synchronising generators across the transmission system.“When demand is greater than generation, the system frequency falls,” Hewitt explains.“The loss of these two power stations caused system frequency to go below 49Hz and, in order to prevent a cascading failure, the network automatically disconnected load.“In normal situations, a network of fast-responding energy assets provides rapid power into the system to make up the shortfall and responds automatically to falling frequency – this is called the frequency reserve service.“For some reason, this service failed to prevent the frequency falling below normal levels.”Power was restored for everyone after about an hour.The power cut affected 500,000 customers of electricity distributor Wester Power Distribution, 300,000 of UK Power Networks, 110,000 of Northern Powergrid, 26,000 of Electricity North West, and an unknown number of people served by SP Energy and Scottish and Southern Energy Networks.Although the power outage lasted an hour, some trains were stuck between stations for up to eight hours.A spokeswoman for Network Rail said this was because, although back-up power systems kicked in, some of the trains were unable to start again on their own.after nearly 4 hours to get to london from brighton and several changes and diversions, I finally arrive at kings cross to find all the trains are cancelled and the station is closed for the night, and no one is being let in or out… This caused gridlock on the network while engineers had to travel between trains to get them up and running again.As many trains and staff were not where they needed to be by the end of the day, this also caused disruption the following day for many services, she added.Newcastle International Airport, along with the city’s metro system, were also affected and the failure of a back-up generator at Ipswich Hospital caused problems for 15 minutes before power was restored.National Grid said parts of the network that shut down were determined automatically and randomly by “protection” systems that ensure the whole system doesn’t cut off.Hewitt adds: “These will be designed to give a progressive response as if too much load is shed the frequency can go the other way and be too high.”The wide geographical spread of the affected locations caused confusion for many people but Harminder Singh, power director at business intelligence company GlobalData, gives an explanation.He says: “The interconnection of the grid today means that a significant disturbance in one part of the grid can have an impact on a larger area.“If two large generators suddenly stop injecting power into the grid, it can impact the grid frequency and cause a large part of it to collapse.”Electrical or mechanical faults are usually the cause of power outages.While equipment can be made more resilient against such issues, this can carry a significant cost that will ultimately end up in the bill payer’s lap.Explaining the causes of a power failure, Singh says: “Grid failures occur primarily due to real-time imbalance between the generation and load.“Apart from the sudden loss of generation from large generators, grid failures could be caused due to natural disasters such as earthquakes or tornadoes, which physically impact the transmission infrastructure.“Cyber-attacks could also potentially cause grid failures.”There was some speculation about whether the UK outage was caused by a cyber-attack but National Grid said it was “very confident that there was no malicious intent or cyber-attack involved”.National Grid has said it will “learn the lessons” from the major power outage but claimed its systems “worked well”, calling the incident an “incredibly rare event”.But the government has confirmed an investigation will be held into what happened to determine whether the operator’s procedures are fit for purpose, while Hewitt wants Ofgem to ensure the report is indeed thorough, while National Grid should hold an internal review to work out how to prevent a recurrence in future.“A full blackout was avoided but it is likely that improvements can be made to the system and processes to limit the requirement to load shed,” he says.“It should work with providers of national infrastructure to protect against these events.”Singh says a range of defence mechanisms that shed loads need to be in place to avoid such large-scale grid failures.“The grid operator will need to enhance the resilience of the grid through these and other methods,” he adds.”Friday’s incident was the first major power failure since May 2008, when about half a million people were affected.This happened when the now-closed Longannet power station, north-west of The transmission system lost 1,510MW, according to National Grid at the time, and caused the frequency to fall.Parts of the network were consequently shut down automatically to protect the overall system.Hewitt says: “Ultimately, the system worked and prevented a full blackout.“This was avoided by the load shedding of just enough demand to bring the system back into balance.”A similar incident took place in the United States in 2003 but resulted in a complete blackout throughout parts of the north-east and midwestern regions – as well as the Canadian province of Ontario – for 14 days because the system wasn’t managed properly.It was initially caused by a software bug in the alarm system of an energy company’s control room, which meant the operator was unaware of the need to redistribute load after supply dropped.What should have been a manageable local blackout cascaded into the collapse of the entire region.In total, 10 million people in Ontario and 45 million in eight US states were affected, while it was believed to have contributed to at least 11 deaths and cost an estimated $6bn.The US-Canada Power System Outage Task Force concluded that a combination of human error and equipment failures were to blame, making 46 recommendations on how to reduce the risk of future incidents.This was the second most widespread blackout in history after the 1999 southern Brazil blackout, in which a chain reaction caused by a lightning strike at a substation affected between 75 million and 97 million people over three months.Singh says: “Another major grid failure occurred in India in July 2012, which impacted the northern, western and eastern grids of the country.“The reasons for this grid failure were skewed load generation balance across the regional grids, grid indiscipline – in terms of overdrawal and under-injection by some utilities – depleted reliability mechanisms, failure of defence mechanisms and absence of primary response from the generators.“In another case, Ukraine suffered from a grid outage in December 2015, which was primarily “Seven 110 kilovolts (kV) substations and twenty-three 35kV substations were disconnected for three hours.“Three different distribution companies were attacked, resulting in several outages that caused approximately 225,000 customers to lose power across various areas.”More recently, a grid collapse caused a blackout in Argentina and Uruguay in June this year, while Indonesia’s capital Jakarta faced a nine-hour blackout that affected ten million people earlier this month.

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